The popular 5040 microtome is of rotary retracting, self-lubricating design and has a heavy cast alloy base and cutting arm. Its robust construction makes it accurate and incredibly reliable. The use of fixed beryllium hinges means that all lateral motion is controlled and allows no slop or play that can be experienced in other, lesser designs which can result in 'chatter' and 'thick and thinning'. Its pawl and ratchet wheel and head-advance design ensures absolute calibration for section thickness accuracy and repeatability.
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